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学生说明
1. Click the green 
2. 
Draw your prediction
3. 
Record your prediction
4. Click the green 
to save your work
5. After you are done experimenting record a comment 
on your prediction to say what happened.
教师备注（学生不可见）
Experiment #2: Vegetable Oil w/food color Vegetable oil in a glass Add 3-4 drops of each food color (red, blue, green) (Before adding: “What will happen?”) Stir (After adding and stirring: “Did anything change?”) - Food coloring goes from big drops to lots of tiny drops. “The oils and food colorings don’t mix with each other, forming an emulsion.” Mel Science
